navigator.version (major, minor, revision) where exposed and possibl updated to be as cross browser as possible

navigator.version.js

/** Andrea Giammarchi
 * WTFPL - http://www.wtfpl.net/
 */
'version' in navigator || (
  navigator.version =
    /(?:(?:OS(?: X)?|Android|Windows(?: NT)) |(?:IEMobile|Version|webOS|Nokia\w+)\/)(\d+)[_.](\d+)(?:[_.](\d+(?:\.\d+)?))?/
    .test(navigator.userAgent) ?
  {
    major: RegExp.$1,
    minor: RegExp.$2 || '0',
    // let me introduce you BB10 versioning ...
    revision: (RegExp.$3 || '0').replace(/^0\./, ''),
    // compare with coercion
    // if (os.version == 7) {}
    // NOTE: the == instead of ===
    // works with other operators too
    // such os.version < 7 etc
    valueOf: function () {
      return this.major;
    }
  } :
  {} // unknown (some browser deos not expose the OS)
);

that's about the WTFPL :) Thanks.
P.S. yes, 10.9 makes sense, I haven't updated to that and I am on 10.8.5